Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Crystallization and Self Assembly

CPP 13.3: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

Structural Characterization of an amorphous-discotic columnar diblock copolymer, Polystyrene-b-Poly(perylene bisimide acrylate) — •Gaurav Gupta¹, Peter Kohn¹, Michael Sommer², Sven Hüttner², Thomas Thurn-Albrecht¹, and Mukundan Thelakkat¹ — ¹Institute for Physics, Martin Luther University, Halle, Germany — ²Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth, Bayreuth,Germany

The property of the block copolymers to self assemble into ordered arrays of micro domains have made them an interesting candidate for the fabrication of nanostructured devices. Amongst the various new materials used in organic electronics, discotic materials self assembling into columnar structures are gaining importance as they exhibit one dimensional charge transport and high charge carrier mobility.

We present here the structural characterization of a semiconductor block copolymer, Polystyrene-b-Poly(perylene bisimide acrylate) PS-b-PPBI using temperature dependent XRD, DSC and TEM with an aim to get an insight of the confinement effects on crystallization. The SAXS measurements reveal that the material is microphase separated forming hexagonally packed PPBI cylinders in PS matrix with a spacing of 21nm between them. From TEM results the diameter of this cylindrical micro domain is estimated to be 20nm. The WAXS study shows that the monoclinic crystal structure of PPBI does not change upon confinement in these nanodimensional cylinders. The crystalline structure melts at 1750C resulting in an isotropic liquid.